Abstract
Olive oil mill wastewaters (OOMW) cause a recurrent environmental pollution problem. The large concentration of phenolic compounds in the organic fraction of OOMW is principally responsible for the phytotoxicity and microbial growth inhibitory effects of the effluent. Candida boidinii, Geotrichum candidum, a Penicillium sp. and Aspergillus niger HA37 were isolated from OOMW. When cultivated directly on an undiluted OOMW-based medium containing 82 g l−1 COD, these strains removed only 4–8% of chemical oxygen demand (COD) and phenolics. In contrast, reduction values attaining respectively 40–73% for phenolics and 45–78% for COD removal in the undiluted OOMW-based medium were obtained when using the strains gradually acclimated to high concentration of OOMW by successive stepwise transfer from media containing COD of 20.5 up to 82 g l−1. Possibly, a sufficient production level of degradation and/or detoxification enzymes has to be attained to overcome the toxic effects of the phenolic fraction of concentrated OOMW. The present investigation calls attention to the necessity of acclimation for certain fungal and yeasts strains potentially useful for treating highly polluted effluents.
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Acknowledgments
The authors wish to thank the Moroccan Government, the Walloon Region of Belgium and the “Agence Universitaire de la Francophonie” for their support. Special thanks are addressed to Laila Triouri for her valuable help in the preparation of the manuscript.
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Aissam, H., Penninckx, M.J. & Benlemlih, M. Reduction of phenolics content and COD in olive oil mill wastewaters by indigenous yeasts and fungi. World J Microbiol Biotechnol 23, 1203–1208 (2007). https://doi.org/10.1007/s11274-007-9348-0
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DOI: https://doi.org/10.1007/s11274-007-9348-0